Medicare Advantage in Flathead County, Montana
10,142 people in Flathead County, Montana were enrolled in Medicare Advantage in October 2026, 34.5% of 29,364 eligible beneficiaries (+0.5 pts since October 2025). Humana Inc. is the largest parent organization with 65% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 4,782 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 2,546 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 21 to 13.
Parent organizations in Flathead County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 6,586 | +1,449 | 65.4% |
| UnitedHealth Group, Inc. | 1,743 | −840 | 17.3% |
| Health Care Service Corporation | 1,453 | −248 | 14.4% |
| CVS Health Corporation | 200 | +6 | 2.0% |
| Elevance Health, Inc. | 61 | +3 | 0.6% |
| Aware Integrated, Inc. | 19 | 0 | 0.2% |
| California Physicians' Service | 16 | 0 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 10,906 beneficiaries in Flathead County were assigned to 116 Medicare Shared Savings Program ACOs, 83.7% of assignable Original Medicare beneficiaries. Together, roughly 89% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.